Using a cloud computing service is simple and straightforward. One can choose the instance with
desired specification, finish payment and then use it right away. Moreover, the underlying physical
machines are managed by cloud service providers and transparent to users.
A
Explanation:
Using a cloud computing service is simple and straightforward. One can choose the instance with
desired specification, finish payment and then use it right away. Moreover, the underlying physical
machines are managed by cloud service providers and transparent to users.
This is the basic concept
of cloud computing, which provides on-demand, scalable, and reliable computing resources and
services over the internet12. Reference: 1: ACA Cloud Computing Exam Preparation Course - Alibaba
Cloud3 2: What Is Alibaba Cloud Academy Certification?4
A/An is a copy of data on a disk at a certain point in time.
B
Explanation:
A snapshot is a copy of data on a disk at a certain point in time. It is used to back up and restore data,
or create custom images.
Snapshots can capture the data of system disks, data disks, and shared
block storage devices1
.
Reference: 1
: Alibaba Cloud Academy, “Snapshot”,
https://edu.alibabacloud.com/elearning/lesson/ACA-Cloud-Computing-Certification/lesson-3-
snapshot
Multiple lower-configuration I/O-optimized ECS instances can be used with
to deliver a high-
availability architecture.
A
Explanation:
Server Load Balancer (SLB) is a service that distributes network traffic across multiple ECS instances
to improve the service capabilities of applications. By using SLB, you can increase the availability and
fault tolerance of your applications. You can also use SLB with Auto Scaling to dynamically adjust the
number of ECS instances based on the traffic load. Multiple lower-configuration I/O-optimized ECS
instances can be used with SLB to deliver a high-availability architecture that can handle traffic spikes
and reduce costs.
Reference:
Alibaba Cloud Server Load Balancer
Alibaba Cloud Elastic Compute Service
ACA Cloud Computing Certification Exam Preparation Course
What is the full name of ECS?
A
Explanation:
Elastic Compute Service (ECS) is an IaaS offering on Alibaba Cloud that provides high-performance,
stable, reliable, and scalable compute capacity in the cloud. ECS eliminates your need to invest in
hardware up front. You can create as many or as few instances as you need in response to changes in
requirements or popularity of your workloads. With an ever-growing selection of instance types, ECS
provides broader and deeper choices to match a wide spectrum of computing
needs. Reference:
What is ECS? - Alibaba Cloud
Alibaba Cloud does not support Intranet communication between products that are not in the same
region, which does not mean ?
D
Explanation:
Alibaba Cloud does not support intranet communication between products that are not in the same
region, which means that ECS instances in different regions cannot communicate with each other on
the intranet, and ECS instances and other products in different regions, such as ApsaraDB for RDS and
OSS instances, cannot communicate with each other on the intranet. However, this does not mean
that Server Load Balancer cannot be deployed for ECS instances in various regions. Server Load
Balancer is a service that distributes traffic among multiple ECS instances according to the configured
forwarding rules. It can be used to balance the load and improve the service availability and fault
tolerance of applications.
Server Load Balancer supports cross-region deployment, which means that
it can distribute traffic to ECS instances in different regions12. Reference: 1: ACA Cloud Computing
Exam Preparation Course - Alibaba Cloud3 2: Server Load Balancer - Alibaba Cloud Documentation
Center4
Reference: https://www.alibabacloud.com/help/doc-detail/40654.htm
If you are running an online ticket booking service with relatively fixed traffic, then which kind of
charging mode is more suitable for you?
B
Explanation:
Prepaid is a charging mode that allows you to pay in advance for a certain amount of resources for a
specified period of time. It is also known as subscription or reserved instance. Prepaid is more
suitable for scenarios with relatively fixed traffic, such as an online ticket booking service, because it
offers lower prices and more stable performance than pay-as-you-go. Pay-as-you-go is a charging
mode that allows you to pay only for the resources you actually use on an hourly basis. It is more
suitable for scenarios with unpredictable or fluctuating traffic, such as a news website or a social
media platform. Paypal-pay and bitcoin-pay are not valid charging modes for Alibaba Cloud
Computing products.
Reference: 1
: Alibaba Cloud Academy, “Charging Modes”,
https://edu.alibabacloud.com/elearning/lesson/ACA-Cloud-Computing-Certification/lesson-1-
charging-modes
When we talk about the ‘Elastic’ feature for ECS product, we are not talking about
.
D
Explanation:
Elastic Computing Service (ECS) is a cloud computing service that provides scalable, on-demand
computing resources for cloud applications. ECS offers elastic computing, elastic storage, and elastic
network features to meet different business needs. However, ECS does not provide elastic
administration, which means that the management and configuration of ECS resources are not
automatically adjusted according to the workload or demand. Users need to manually create,
modify, or delete ECS instances, disks, snapshots, security groups, and other resources. Users can
also use other Alibaba Cloud services, such as Auto Scaling, Server Load Balancer, and Cloud Monitor,
to enhance the elasticity and availability of ECS.
Reference:
[Alibaba Cloud Elastic Compute Service]
ACA Cloud Computing Certification Exam Preparation Course
Alibaba Cloud ACA-Cloud1 ACA Cloud Computing Certification Exam
Your website has high volume of traffic and sudden spikes for a very short time. In this scenario,
can manage traffic peak efficiently and maintain a consistent user experience.
B
Explanation:
Auto Scaling is a service that automatically adjusts computing resources based on your volume of
user requests.
When the demand for computing resources increases, Auto Scaling automatically adds
ECS instances to serve additional user requests, or alternatively removes instances in the case of
decreased user requests1
.
Auto Scaling can help you manage traffic peaks efficiently and maintain a
consistent user experience by scaling up or down your ECS instances according to your predefined
policies and business needs2. Reference: 1
:
Auto Scaling: Automatically Adjusts Computing
Resources - Alibaba Cloud2
:
Overview - Auto Scaling - Alibaba Cloud Documentation Center
.
Reference: https://www.alibabacloud.com/blog/designing-a-cloud-based-architecture-for-internet-
of-vehicles- iov-series-ii_594263
Your website has oscillating traffic peaks that are difficult to predict in advance. In this scenario, it is
recommended to use SLB and together with ECS.
B
Explanation:
Your website has oscillating traffic peaks that are difficult to predict in advance. In this scenario, it is
recommended to use SLB and Auto Scaling together with ECS. SLB is a service that distributes traffic
among multiple ECS instances according to the configured forwarding rules. It can be used to balance
the load and improve the service availability and fault tolerance of applications. Auto Scaling is a
service that automatically adjusts computing resources based on your volume of user requests.
When the demand for computing resources increases, Auto Scaling automatically adds ECS instances
to serve additional user requests, or alternatively removes instances in the case of decreased user
requests.
By using SLB and Auto Scaling together with ECS, you can achieve high scalability and
elasticity for your website, and cope with the changing traffic patterns12. Reference: 1: ACA Cloud
Computing Exam Preparation Course - Alibaba Cloud3 2: Auto Scaling: Automatically Adjusts
Computing Resources - Alibaba Cloud4
is a ready-to-use service that seamlessly integrates with Elastic Compute Service (ECS) to
manage varying traffic levels without manual intervention.
A
Explanation:
Server Load Balancer (SLB) is a ready-to-use service that seamlessly integrates with Elastic Compute
Service (ECS) to manage varying traffic levels without manual intervention.
SLB distributes incoming
traffic among multiple ECS instances according to the configured forwarding rules, increasing the
service capabilities and fault tolerance of your applications1
.
SLB supports Layer-4 (TCP/UDP) and
Layer-7 (HTTP/HTTPS) load balancing, health checks, session persistence, cross-zone disaster
recovery, and other advanced features2
.
Reference: 1: Alibaba Cloud Academy, “Server Load Balancer”,
https://edu.alibabacloud.com/elearning/lesson/ACA-Cloud-Computing-Certification/lesson-4-
server-load-balancer 2
: Alibaba Cloud, “What is Server Load Balancer?”,
https://www.alibabacloud.com/help/doc-detail/27539.htm
When using Alibaba Cloud SLB, you can set different weights for backend ECS instances. The higher
the weight of a backend ECS instance, the more load will be assigned to it. If an SLB instance has 5
ECS instances in the backend server pool, all of which are healthy. Among these 5 ECS instances, the
weight of ecs_inst1 is set to 100. Which of the following statements is correct?
A
Explanation:
Alibaba Cloud Server Load Balancer (SLB) is a service that distributes network traffic across multiple
ECS instances to improve the service capabilities of applications. SLB supports different load
balancing algorithms, such as round robin, weighted round robin, and least connections. When using
the weighted round robin algorithm, SLB assigns different weights to backend ECS instances based on
their processing capabilities. The higher the weight of a backend ECS instance, the more requests it
will receive from SLB. However, the weight of a backend ECS instance is not the only factor that
determines the load distribution. The number and the weight of other backend ECS instances in the
same server group also affect the load balancing result. Therefore, without knowing the weight
settings of the remaining 4 ECS instances, we cannot tell what would happen to the load distribution
among the 5 ECS instances. The other statements are incorrect because they assume a fixed or
proportional load distribution based on the weight of ecs_inst1, which is not necessarily true.
Reference:
Alibaba Cloud Server Load Balancer
[ACA Cloud Computing Certification Exam Preparation Course]
Alibaba Cloud Computing Exam Question 2022
Server Load Balancer can help protect from
attack.
A
Explanation:
Server Load Balancer (SLB) can help protect from distributed denial-of-service (DDoS) attacks by
distributing network traffic across groups of backend servers to improve the service capability and
application availability. SLB also supports built-in Anti-DDoS services to ensure business
security.
Anti-DDoS services can mitigate DDoS attacks at the Tbit/s level and provide multiple
defense methods, such as blackhole filtering, traffic scrubbing, and access control1
.
In addition, you
can integrate Application Load Balancer (ALB) with Web Application Firewall (WAF) in the console to
ensure security at the application layer and prevent attacks such as SQL
injection2. Reference: 1
:
Server Load Balancer(SLB) - Alibaba Cloud2
:
Associate an EIP protected by
Anti-DDoS Pro/Premium with an ALB instance - Server Load Balancer - Alibaba Cloud Documentation
Center
.
Reference: https://www.alibabacloud.com/help/doc-detail/27539.htm
Which of the following statements to OSS bucket is not correct?
B
Explanation:
A bucket is a container for objects in Object Storage Service (OSS). Every user can create more than
one bucket, but every bucket should have a unique name in OSS. There is no limitation to the
number of objects inside one bucket. However, the bucket name cannot be changed after
creation.
You cannot customize, change, or request a namespace name change1
.
If you want to
modify an object, you must upload a new object with the same name as the existing one to replace
it2. Reference: 3: Create a bucket - Object Storage Service - Alibaba Cloud3 4: Manage objects in a
versioning-enabled bucket - Object Storage Service - Alibaba Cloud4 1: Understanding Object Storage
Namespaces - Oracle1 2: OSS Concepts - Alibaba Object Storage Service Course - Cloud Academy2
Reference: https://www.alibabacloud.com/help/doc-detail/31885.htm?
spm=a2c63.p38356.a3.3.43f03bb9a3KjLl
www.company.com is a newly launched social portal for exchanging automotive information. The
portal is based on PHP, including 10GB of images, and some JavaScripts files. Currently one single ECS
instance is used to host all the application content as well as a MySQL database. With the growing
number of users, the portal is getting slower to load images or respond to user requests. Moreover,
there will be additional 50GB image content uploaded to the portal every week. Which combination
of Alibaba Cloud services below can help resolve the storage and performance issue at the same
time?
A
Explanation:
Object Storage Service (OSS) is a cloud storage service that provides secure, cost-effective, and
scalable storage for various data types, such as images, videos, and documents. OSS can store large
amounts of data and support concurrent access from multiple users. OSS can also integrate with
other Alibaba Cloud services, such as Media Transcoding Service (MTS), Server Load Balancer (SLB),
and Elastic Compute Service (ECS). By using OSS, the portal can offload the storage and delivery of
the image content from the ECS instance, which can improve the performance and availability of the
application.
Content Delivery Network (CDN) is a distributed network that delivers content to users based on
their geographic locations, the origin servers, and the content delivery policies. CDN can accelerate
the delivery of static and dynamic content, such as images, videos, and web pages, by caching the
content at edge nodes that are closer to the users. CDN can also reduce the network latency and
bandwidth consumption, as well as enhance the security and reliability of the content delivery. By
using CDN, the portal can speed up the loading of images and improve the user experience.
Therefore, the combination of OSS and CDN can help resolve the storage and performance issue of
the portal at the same time. The other combinations are not as effective or suitable for the portal’s
scenario. OSS + MTS combination can help with the storage and transcoding of media files, but not
with the delivery of images. OSS + RDS combination can help with the storage and management of
relational databases, but not with the loading of images. OSS + ECS combination can help with the
storage and computing of data, but not with the acceleration of content delivery.
Reference:
Alibaba Cloud Object Storage Service
Alibaba Cloud Content Delivery Network
ACA Cloud Computing Certification Exam Preparation Course
Which method is not supported by OSS to create a bucket?
B
Explanation:
ECS instance filesystem directory operation is not a supported method to create a bucket in OSS. A
bucket is a container for objects in OSS, and it is not related to the filesystem of an ECS instance.
To
create a bucket in OSS, you can use one of the following methods1
:
through OSS API/SDK: You can use the OSS API or SDK to call the PutBucket operation to create a
bucket.
The OSS API and SDK support various programming languages, such as Java, Python, PHP, C#,
and Node.js2
.
through oss cmd tool: You can use the oss cmd tool, which is a command-line tool based on the OSS
SDK for Python, to create a bucket by using the ossutil mb command3
.
through cloud console: You can use the Alibaba Cloud console to create a bucket by following the
steps in the documentation4. Reference: 1
:
Create buckets - Object Storage Service - Alibaba Cloud
Documentation Center2
:
PutBucket - API Reference| Alibaba Cloud Documentation Center3
:
Create a
bucket - OSSUTIL User Guide| Alibaba Cloud Documentation Center4
:
Create a bucket - Object
Storage Service - Alibaba Cloud Documentation Center
.